Sanitary amentities in vans and at campsites

Hi folks,
The issue of showers and toilets is important.
I wonder how:
1) in vans:
a) water tanks;
b) toilet tubes;
c) shower cabins, and
d) kitchen sink,
operate, and also whether:
2) at campsites:
a) toilets and showers;
b) water supply;
c) electricity supply;
4) waste disposal
are available.

What I mean, among the rest, is this. As far as I understand, vans are provided with embedded water tanks and there must be some outside facilities like pumps and hoses to inject water. Also, I understand that the toilet includes a special box to accumulate you know what. Does the box smell? How is it cleansed? Can this cleansing task be outsourced?

More people, quick feedback - caravanersforum.com ;)

Very Thanks alexabda.

This is the most important things that we can think of first when going on a trip or having a camp. Thanks a lot for reminding us again.